JPWO2018029730A1 - Tire vulcanizing mold, tire vulcanizing apparatus and method for manufacturing tire - Google Patents

Abstract

The tire vulcanizing mold according to the embodiment includes sectors 13 divided in the tire circumferential direction for molding the tread portion 1, and a pair of upper and lower side plates 11 and 12 for molding the sidewall portion 2, and Mold division lines 16 a and 17 a formed by the side plates are located in the tread portion 1. A lateral groove forming rib 18 for forming the lateral groove 5 in the tread portion is provided straddling from the sector to the side plate, and a projection forming concave portion 18a for forming the protrusion 5a in the groove bottom of the lateral groove 5 is for lateral groove forming The rib 18 is provided. The mold dividing surfaces 16 and 17 divide the lateral groove molding rib 18 at a position where the protrusion molding concave portion 18a is not provided, and the lateral groove molding rib 18 is provided with the mold division surface from the protrusion molding concave portion 18a. An exhaust path 19 leading to the

Description

  The present invention relates to a tire vulcanizing mold, a tire vulcanizing apparatus including the tire vulcanizing mold, and a method of manufacturing a tire.

  A tire is manufactured by producing an unvulcanized green tire and vulcanizing the green tire by molding it into a predetermined shape using a tire vulcanizing apparatus.

  The tire vulcanizing apparatus is known as a vulcanizing mold for molding a green tire into a predetermined shape, including a sector forming a tread portion of the tire and a pair of upper and lower side plates forming a sidewall portion of the tire. It is done.

  In this tire vulcanizing apparatus, after setting the green tire on the lower side plate in a mold open state in which the upper side plate and the sector are separated from the lower side plate, the upper side plate is lowered and the sector is lowered. By moving the tire inward in the tire radial direction, the upper side plate and the sector are brought close to the lower side plate, and the mold is closed. The sectors are divided into a plurality of parts in the circumferential direction and radially separated in the mold open state, and gathered close to each other in the mold closed state to form an annular shape.

  Various patterns of irregularities are formed on the outer surface of the tread portion and the sidewall portion. In order to improve the design of the tire, a continuous uneven shape may be formed from the tread portion to the sidewall portion. In the case of forming such a pattern, when the mold parting line formed by the sector and the side plate is disposed in the sidewall part, the rubber which is protruded at the mold parting line may be generated at a position where the appearance is conspicuous.

  On the other hand, there is known a technique in which a mold parting line formed by sectors and side plates is disposed in a tread portion (see Patent Documents 1 and 2). In this case, it is possible to suppress the generation of the protruding rubber at the side wall portion that is easily noticeable.

JP 2001-96538 A JP 2000-87936 A

  By the way, for example, a protrusion for preventing stone biting may be disposed at the groove bottom of the lateral groove of the tread portion. Such projections may have depressions due to air accumulation called "bears" due to insufficient exhaustion at the time of vulcanization molding, which may result in molding failure.

  An object of this invention is to provide the tire vulcanizing mold which can improve the moldability of the processus | protrusion arrange | positioned in the groove bottom of a horizontal groove in view of the above point.

  The tire vulcanizing mold according to the present invention comprises sectors divided in the circumferential direction of the tire for molding the tread portion of the tire and a pair of upper and lower side plates for molding the sidewall portion of the tire, and the sectors and the upper and lower sides It is a tire vulcanizing mold for vulcanizing and forming a tire, wherein a mold parting line formed by the pair of side plates is located in the tread portion. A lateral groove forming rib for forming a lateral groove in the tread portion is provided straddling the side plate from the sector. A projection molding recess for molding a projection on the groove bottom of the lateral groove is provided in the lateral groove molding rib. A mold division surface including the mold division line is provided to divide the lateral groove molding rib at a position where the projection molding recess is not provided, and the projection molding recess to the mold division surface A connecting exhaust path is provided in the lateral groove molding rib.

  In one embodiment, a plurality of the projection molding recesses are provided in the lateral groove molding rib, the mold division surface is set to pass between the adjacent projection molding recesses, and the exhaust path is at least one. It may be provided on the mold division surface from the protrusion molding recess. In that case, the exhaust path may be provided from the recess for projection molding on both sides of the mold division surface to the mold division surface. Further, the exhaust path may be a cylindrical hollow portion. The exhaust path may be a conical cavity. The exhaust path may be in the form of a slit. 5 mm or less may be sufficient as the distance from the said recessed part for protrusion molding, and the said metal mold | die dividing surface.

  In the tire vulcanizing apparatus according to the present invention, the tire vulcanizing mold, a segment fixed to the sector and moving the sector in the radial direction of the tire, fixed to a pair of upper and lower side plates can slide the segment And a pair of upper and lower mounting plates to support the

  In one embodiment, in the tire vulcanizing apparatus, the segment includes a pair of upper and lower sliding surfaces sliding on the upper and lower pairs of mounting plates, and the upper and lower pairs of sliding surfaces are closer to the tire radial direction than the tire radial direction. When the sector is moved outward in the tire radial direction, the upper and lower pair of sliding surfaces slide on the upper and lower pair of mounting plates, and the mold is divided The spacing between the faces may be increased. In that case, the mold division surface may be provided in parallel with the tire radial direction.

  The method of manufacturing a tire according to the present invention includes a forming step of forming a green tire, and a vulcanization step of forming a green tire by vulcanization using the above-described tire vulcanizing apparatus.

  In the present embodiment, the mold division surface of the sector and the side plate is provided at a position other than the recess for forming the projection, and the exhaust path leading from the recess for forming the projection to the mold division surface is provided. The air of the projection molding recess can be exhausted using the mold division surface. Therefore, the moldability of the protrusion of the groove bottom can be improved.

A half sectional view showing a state at the time of vulcanization of a tire vulcanizing apparatus according to one embodiment The top view which shows the tread pattern which concerns on the same embodiment Sectional view at the time of tire vulcanization in the III-III line of FIG. 2 Principal part enlarged sectional view of rib for lateral groove molding V-V sectional view of FIG. 4 VI-VI line sectional view of FIG. 4 Diagram for explaining the opening and closing operation of the tire vulcanizing apparatus Diagram for explaining the opening and closing operation of the tire vulcanizing apparatus Diagram for explaining the opening and closing operation of the tire vulcanizing apparatus The main part enlarged view of FIG. 9 The main part enlarged view of FIG. 9 Principal part enlarged sectional view of rib for lateral groove molding concerning other embodiments Cross-sectional view of a lateral groove molding rib according to still another embodiment

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  The tire vulcanizing apparatus, as shown in FIG. 1, includes a tire vulcanizing mold (hereinafter simply referred to as a vulcanizing mold) 10, a container 30 to which the vulcanizing mold 10 is attached, a vulcanizing mold 10 and a container A first raising / lowering means 50 and a second raising / lowering means 51 for moving up and down 30 and a bladder 60 are provided. The tire vulcanizing apparatus vulcanizes an unvulcanized green tire, which is set so that the axial direction of the tire is up and down, by molding it into a predetermined shape by heating and pressing.

  The vulcanizing mold 10 includes a pair of upper and lower upper side plates 11 and a lower side plate 12, a plurality of circumferentially divided sectors 13, and a pair of upper and lower bead rings 14 and 15. It is a mold that forms the surface (design surface). As a material of the vulcanization mold 10, metal materials such as aluminum, aluminum alloy, iron and the like can be used.

  The sector 13 is a mold for molding the tread portion 1 of the tire T. The sector 13 is divided into a plurality (for example, nine) in the circumferential direction of the tire and is provided so as to be able to expand and contract in the radial direction of the tire (tire radial direction) . In the mold closing state in which the sectors 13 are arranged at the mold closing position, the sectors 13 adjacent to each other in the tire circumferential direction are close to each other to form an annular shape.

  The upper side plate 11 is a mold for molding the sidewall portion 2 and the bead portion 3 disposed above the tire T. The lower side plate 12 is a mold for molding the sidewall portion 2 and the bead portion 3 disposed below. Bead rings 14 and 15 are provided on the inner side in the tire radial direction of the upper side plate 11 and the lower side plate 12, respectively. The bead rings 14 and 15 are configured such that the bead portion 3 of the tire T can be fitted.

  The vulcanizing mold 10 is a combined parting line (parting line) that divides the mold in the tire width direction, that is, a mold parting line 16 a formed by the sector 13 and the upper side plate 11, and the sector 13 And the lower side plate 12 to form a mold parting line 17a. The mold parting lines 16a and 17a are located in the tread portion 1 of the tire T, and therefore, in the vulcanized mold 10, the sector 13 and the pair of upper and lower side plates 11 and 12 have a tire width at the tread surface. It is configured to be divided into directions.

  A mold division surface including the mold division lines 16a and 17a, that is, a mold division surface 16 which is a mating surface of the sector 13 and the upper side plate 11, and a mating surface of the sector 13 and the lower side plate 12. The mold division surfaces 17 both extend outward from the mold division lines 16a and 17a in the tire radial direction, and are provided parallel (that is, horizontally) to the tire radial direction which is the moving direction of the sectors 13 in this example. ing. The mold parting lines 16a and 17a are parting lines located at the inner ends of the mold parting surfaces 16 and 17, that is, the ends facing the cavity.

  In the vulcanizing mold 10, a main groove molding rib (not shown) for molding a main groove extending in the tire circumferential direction in the tread portion 1 and a lateral groove extending in the tire width direction in the tread portion 1 A lateral groove molding rib 18 is provided (see FIG. 3). The lateral groove molding rib 18 is provided across the sector 13 and the side plates 11 and 12. Further, the lateral groove molding rib 18 is provided with a projection molding concave portion 18 a for molding a projection on the groove bottom of the lateral groove.

  FIG. 2 is a view showing an example of a tread pattern. The tread portion 1 includes a plurality of blocks divided by a main groove 4 extending in the tire circumferential direction while being bent and a lateral groove 5 intersecting the main groove 4. The tire circumferential direction is a direction indicated by a symbol CD in FIG. The tire width direction is a direction indicated by a symbol WD, the tire width direction inner side (that is, the central portion side) is a direction approaching the tire equator CL, and the tire width direction outer side is a direction away from the tire equator CL.

  The tread portion 1 has a pair of center block rows 6a and 6a located in a center region including the tire equator CL, and a pair of shoulder block rows 6b and 6b located in shoulder regions on both sides thereof. The shoulder region is a region located at the end in the tire width direction of the tread portion, and is a region including the tire ground contact end sandwiched between the main groove and the tire ground contact end.

  The shoulder block row 6b has a first land portion (block) 7 having a first tread end 7a and a second land end 7a having a second tread end 8a located on the outer side in the tire width direction than the first tread end 7a. The parts (blocks) 8 are alternately provided in the tire circumferential direction.

  As shown in FIG. 2 and FIG. 3, the lateral groove 5 partitioning the first land portion 7 and the second land portion 8 is provided with a projection 5 a for preventing stone biting called a stone ejector at the bottom of the groove. It is done. The protrusion 5 a is a ridge-like protrusion, that is, a ridge, protruding from the groove bottom at the center in the width direction of the lateral groove 5 and extending along the longitudinal direction of the lateral groove 5. The protrusions 5a are provided at intervals from the side surfaces of the land portions 7, 8 on both sides. Each of the lateral grooves 5 is provided with a plurality of protrusions 5a at intervals in the longitudinal direction, and in this example, the first protrusions 5a1 and the first protrusions 5a1 are located on the outer side in the tire width direction and A second protrusion 5a2 which is longer than the protrusion 5a1 is provided.

  The lateral groove molding rib 18 is a rib for molding the lateral groove 5 that divides the first land portion 7 and the second land portion 8. As shown in FIGS. 3 to 5, the lateral groove forming rib 18 is provided with a protrusion forming recess 18 a for forming the protrusion 5 a on the top surface 18 b thereof. The protrusion molding recess 18 a has a groove shape extending in the longitudinal direction of the lateral groove molding rib 18.

  Each of the lateral groove molding ribs 18 is provided with a plurality of projection molding concave portions 18a at intervals in the length direction, and in this example, a first concave portion 18a1 for molding the first projection 5a1, and A second recess 18a2 is provided on the outer side of the first recess 18a1 in the tire width direction to mold the second protrusion 5a2.

  In the present embodiment, the mold division surfaces 16 and 17 are set to divide the lateral groove molding rib 18 at a position where the protrusion molding concave portion 18 a is not provided. As shown in FIG. 3, FIG. 4 and FIG. 6, in this example, gold is passed so as to pass between the protrusion molding recesses 18a adjacent in the tire width direction, that is, between the first recess 18a1 and the second recess 18a2. The mold division surface 17 is set. The mold parting surface 17 passes through the center between the first recess 18a1 and the second recess 18a2. Although not shown, the same applies to the mold division surface 16. Therefore, as shown in FIG. 2, in the shoulder region of the tread portion 1, the mold parting lines 16 a and 17 a cross the first land portion 7 and the second land portion 8 of the shoulder block row 6 b and the protrusion 5 a It crosses the lateral groove 5 at a position where it does not cross. In detail, the mold parting lines 16a and 17a pass between the first protrusion 5a1 and the second protrusion 5a2. The mold parting lines 16a and 17a extend in parallel in the tire circumferential direction over the entire circumference, and the distance from the tire equator CL to the mold parting lines 16a and 17a is set uniformly over the entire circumference.

  As shown in FIG. 3, the lateral groove molding rib 18 provided straddling from the sector 13 to the lower side plate 12 is divided by the mold division surface 17. Similarly, the lateral groove molding rib 18 provided so as to straddle the sector 13 to the upper side plate 11 is divided by the mold division surface 16. Therefore, the lateral groove molding rib 18 includes a first rib 18x provided to the sector 13 and a second rib 18y provided to the side plates 11 and 12, and these first rib 18x and the second rib It is comprised by joining the part 18y in the metal mold | die dividing surfaces 16 and 17. As shown in FIG. In this example, the first recess 18a1 is provided in the first rib portion 18x, and the second recess 18a2 is provided in the second rib portion 18y.

  In the present embodiment, the lateral groove molding rib 18 is provided with an exhaust path 19 connected from the protrusion molding recess 18 a to the mold division surfaces 16 and 17 (see FIGS. 3 to 6). In this example, two exhaust paths 19a and 19b are provided, which are connected from the first recess 18a1 and the second recess 18a2 to the mold split surfaces 16 and 17, respectively. ing.

  The exhaust path 19 is a hole formed to penetrate the mold dividing surfaces 16 and 17 from the end face of the protrusion molding concave portion 18 a on the mold dividing surface 16 and 17 side, and in this example, it is formed in a cylindrical hollow portion ing. Further, as shown in FIGS. 4 and 6, the pair of exhaust paths 19a and 19b provided on both sides of the mold division surfaces 16 and 17 have the same opening position in the mold division surfaces 16 and 17, respectively. They are in communication with each other, and in this example, the opening shapes overlap each other.

  As shown in FIGS. 2 and 6, in this example, the lateral groove 5 is inclined with respect to the tire width direction, and accordingly, the projections 5a to the projection molding recess 18a are also inclined with respect to the tire width direction. . The exhaust path 19 is provided to be inclined with respect to the tire width direction so as to extend along the longitudinal direction of the lateral groove 5, but parallel to the tire width direction, that is, perpendicular to the mold division surfaces 16 and 17. You may form.

  It is preferable from the viewpoint of suppressing the clogging of the exhaust passage 19 that the length of the exhaust passage 19, that is, the distance D0 from the projection molding concave portion 18a to the mold division surfaces 16 and 17 is 5 mm or less. That is, it is preferable to set the mold division surfaces 16 and 17 in the vicinity of the protrusion molding recess 18 a so that the exhaust path 19 is not unnecessarily long.

  The container 30 supports a plurality of segments 31 for holding the sectors 13, a jacket ring 32 for moving the segments 31 in the tire radial direction, an upper side plate 11 and an upper bead ring 14, and is disposed on the upper side of the segments 31. And a lower mounting plate 34 that supports the lower side plate 12 and the lower bead ring 15 and is disposed below the segment 31.

  The segments 31 are provided for each of the divided sectors 13 on the outer side in the tire radial direction of the sectors 13, and each segment 31 is fixed to the corresponding sector 13 by a bolt 35.

  The upper surface of the segment 31 is provided with an upper sliding surface 36 that inclines toward the tire width direction central portion (that is, downward) toward the tire radial direction outer side. The upper sliding surface 36 slides the upper slide 37 provided on the upper mounting plate 33. A lower sliding surface 38 is provided on the lower surface of the segment 31 so as to be inclined toward the central portion in the tire width direction (that is, upward) toward the outer side in the tire radial direction. The lower sliding surface 38 slides on the lower slide 39 provided on the lower mounting plate 34.

  The inclination angle of the upper sliding surface 36 and the lower sliding surface 38 is not particularly limited, but is preferably 5 ° or more and 10 ° or less with respect to the tire radial direction. Further, the upper sliding surface 36 and the lower sliding surface 38 provided in the segment 31 preferably consist of a flat surface that does not bend, and slide in a surface contact with the upper slide 37 and the lower slide 39. Move.

  In the segment 31, the side opposite to the side on which the sector 13 is attached (outside in the tire radial direction) forms an inclined surface 40 which is inclined downwardly in the tire radial direction.

  The jacket ring 32 is an annular member provided radially outward of the plurality of segments 31. The inner peripheral surface of the jacket ring 32 is inclined along the inclined surface 40 provided on the tire radial direction outer side of the segment 31 and is slidably attached to the inclined surface 40. The jacket ring 32 moves the segment 31 in the tire radial direction while sliding on the inclined surface 40 by moving up and down relative to the segment 31. Thus, the sector 13 is configured to be able to expand and contract in the tire radial direction.

  The upper side plate 11 and the upper slide 37 are fixed to the lower surface of the upper mounting plate 33. The upper slide 37 is disposed on the outer side of the upper side plate 11 in the tire radial direction and opposed to the upper sliding surface 36 provided on the upper surface of the segment 31 so that the segment 31 can slide in the tire radial direction To support.

  The lower side plate 12 and the lower slide 39 are fixed to the upper surface of the lower mounting plate 34. The lower slide 39 is disposed at a position radially outward of the lower side plate 12 in the tire radial direction and opposed to the lower sliding surface 38 provided on the lower surface of the segment 31, and slides the segment 31 in the tire radial direction. Support movable.

  The first lifting means 50 moves the upper mounting plate 33 up and down relative to the lower mounting plate 34. The second lifting means 51 vertically moves the jacket ring 32 separately from the segment 31 supported by the upper mounting plate 33.

  The bladder 60 is formed of a toroidal-shaped expandable rubber elastic body having an axially central portion bulging outward, and is disposed on the inner surface side of the green tire to be a pressurized gas (for example, steam, nitrogen gas, etc.) The supply swells and pressurizes the green tire from the inside. The upper end and the lower end, which are both axial end portions, of the bladder 60 are supported by the expandable support portion 61. The expandable support portion 61 includes an upper clamp ring 62 fixing the upper end portion of the bladder 60, a lower clamp ring 63 fixing the lower end portion of the bladder 60, and an expandable telescopic shaft portion 64.

  A method of manufacturing a pneumatic tire using a tire vulcanizing apparatus having the above configuration will be described. At the time of production, a green tire is molded by a known method, and the green tire is vulcanized and molded using the above-described tire vulcanizing apparatus.

  FIGS. 7-9 is a figure explaining the opening-and-closing operation | movement of the said tire vulcanizing apparatus, and the green tire and the bladder 60 are abbreviate | omitted in all.

  In the vulcanizing step, the green tire is mounted on the vulcanizing mold 10 of the tire vulcanizing device in the mold open state, and the bladder 60 is mounted on the inner surface side of the green tire. FIG. 7 shows the mold open state, in which the sector 13 and the upper side plate 11 are spaced apart upward from the fixed lower side plate 12. After the green tire is attached to the lower side plate 12 in this state, the container 30 is lowered. Specifically, the first lifting means 50 is lowered to lower the upper side plate 11 and the sector 13 provided on the upper mounting plate 33, that is, to move them toward the lower side plate 12.

  When the segment 31 abuts on the lower mounting plate 34 as shown in FIG. 8, the sector held by the segment 31 is then lowered by lowering the jacket ring 32 by the second lifting means 51 as shown in FIG. 13 is moved inward in the tire radial direction.

  At this time, in the segment 31, the lower sliding surface 38 slides on the lower slide 39 of the lower mounting plate 34, and the upper sliding surface 36 slides on the upper slide 37 of the upper mounting plate 33. Move radially inward. The upper sliding surface 36 and the lower sliding surface 38 are inclined toward the center in the tire width direction toward the outer side in the tire radial direction. Therefore, when the sector 13 moves inward in the tire radial direction together with the segment 31, the upper side plate 11 descends due to the inclination of the upper sliding surface 36, and the sector 13 descends due to the inclination of the lower sliding surface 38.

  Therefore, as the segment 31 moves inward in the tire radial direction, the distance between the upper side plate 11 and the lower side plate 12 decreases, and the sector 13 and the upper and lower sides are not when the mold closing state shown in FIG. There is no space between the mold division surfaces 16 and 17 formed by the plates 11 and 12. That is, at a stage where the sector 13 is moving inward in the tire radial direction, there is a gap between the mold division surface 16 between the sector 13 and the upper side plate 11, and the sector 13 and the lower side plate 12 There is also a gap in the mold parting surface 17 of. At the stage where the diameter of the sector 13 is completely reduced, the gap between the mold division surfaces 16 and 17 disappears.

  In this way, the vulcanized mold 10 is brought into the mold closed state shown in FIG. 1, and pressurized gas is supplied into the bladder 60 to expand it, whereby the green between the vulcanized mold 10 and the bladder 60 is obtained. By pressurizing and heating the tire and maintaining this state for a predetermined time, vulcanization molding of the tire T is performed.

  After the green tire is vulcanized, the vulcanizing mold 10 is opened, and the vulcanized tire T is taken out from the tire vulcanizing apparatus. In order to make the vulcanizing mold 10 change from the mold closing state to the mold opening state, the reverse operation to the above-described mold closing operation may be performed.

  Specifically, first, by raising the jacket ring 32 by the second lifting means 51, the sector 13 held by the segment 31 is moved outward in the tire radial direction. At that time, as shown in FIG. 9, when the segment 31 moves outward in the tire radial direction, the upper sliding surface 36 pushes the upper mounting plate 33 upward while lifting the upper slide 37 of the upper mounting plate 33 in the tire radial direction. Slide outwards. The lower sliding surface 38 slides outward in the tire radial direction while rising on the lower slide 39 of the lower mounting plate 34.

  The upper mounting plate 33 pushed upward by the upper sliding surface 36 moves upward with respect to the segment 31, so when the segment 31 starts moving radially outward, as shown in FIG. 10, the upper side The plate 11 also moves upward with respect to the segment 31, and the distance between the mold dividing surfaces 16 formed by the sectors 13 and the upper side plate 11 increases.

  Also, on the lower sliding surface 38, when the segment 31 starts moving radially outward, the segment 31 moves upward with respect to the fixed lower mounting plate 34 as shown in FIG. The distance between the mold division surfaces 17 formed by the lower side plate 12 and the lower side plate 12 is increased.

  Then, after the diameter expansion of the sector 13 is completed as shown in FIG. 8, the first lifting means 50 is raised, and the upper side plate 11 and the sector 13 with respect to the lower side plate 12 as shown in FIG. Move apart. Then, the vulcanized tire T is taken out from the tire vulcanizing device in the mold open state.

  According to the present embodiment, as described above, by providing the exhaust path 19 connecting the projection molding recess 18 a for molding the projection 5 a of the groove bottom to the mold division surfaces 16 and 17, At the time of mold closing, the air in the protrusion molding recess 18 a can be exhausted from the mold division surfaces 16 and 17 through the exhaust path 19. In particular, according to the present embodiment, the above-mentioned inclination of the upper sliding surface 36 and the lower sliding surface 38 ensures a gap in the mold division surfaces 16 and 17 until just before completion of mold closing. Since the exhaust passage 19 is opened, more effective exhaust is possible. Therefore, the bareness in the protrusion 5a can be suppressed, and the moldability can be improved.

  Further, the mold division surfaces 16 and 17 are set so as to pass between the adjacent projection molding concave portions 18a1 and 18a2, and then the projection molding concave portions 18a1 and 18a2 on both sides are respectively connected to the mold division surfaces 16 and 17 Exhaust paths 19a and 19b are provided. Therefore, the moldability can be improved for both of the ridges 5a1 and 5a2 adjacent in the tire width direction.

  According to the present embodiment, when the segment 31 starts to move radially outward due to the inclination of the upper sliding surface 36 and the lower sliding surface 38, the sector 13, the upper side plate 11, and the lower side The distance between the mold division surfaces 16 and 17 formed by the plate 12 is increased. Therefore, even if the opening and closing of the tire vulcanizing apparatus is repeated, the distance between the mold dividing surfaces 16 and 17 can be maintained at an appropriate value without the mold dividing surfaces 16 and 17 rubbing each other, and the durability of the tire vulcanizing apparatus can be maintained. It is possible to improve the quality. Moreover, immediately after the segment 31 starts moving radially outward, the upper side plate 11 moves in a direction away from the tire T after vulcanization molding, so that the tire T can be easily removed from the mold.

  Further, in the tire vulcanizing apparatus of the present embodiment, the upper sliding surface 36 and the lower sliding surface 38 provided in the segment 31 slide in surface contact with the upper slide 37 and the lower slide 39. If it is flat, the segment 31 can be moved with high positional accuracy without rattling, and positional deviation of the sector 13 in the mold closed state can be suppressed.

  In the above embodiment, the mold division surfaces 16 and 17 are provided in parallel with the tire radial direction, but may be provided obliquely with respect to the tire radial direction. That is, the mold division surfaces 16 and 17 may be provided so as to incline toward the outer side in the tire width direction toward the outer side in the tire radial direction. Even in this case, the inclination of the upper sliding surface 36 and the lower sliding surface 38 facilitates the removal of the tire from the tire. Also, even if the sliding surfaces 36 and 38 wear out due to repeated mold opening and closing and the distance between the upper side plate 11 and the lower side plate 12 narrows, the movement of the segment 31 in the tire radial direction Since the gap between the upper side plate 11 and the lower side plate 12 can be narrowed gradually because of this, mold friction can be prevented at an early stage of the mold split surfaces 16 and 17 to improve the durability. Can.

  FIG. 12 is a view showing the cross section of the main part of the rib for lateral groove molding 18 in the tire vulcanizing apparatus according to the second embodiment. The second embodiment differs from the first embodiment having the cross-sectional structure shown in FIG. 6 in the shape of the exhaust passage 19 provided in the lateral groove molding rib 18.

  That is, the exhaust path 19x according to the second embodiment is formed in a conical hollow portion. The exhaust path 19 x has an inverse tapered shape in which the diameter gradually increases from the protrusion molding recess 18 a toward the mold division surfaces 16 and 17. As in the first embodiment, the pair of exhaust paths 19x and 19x provided on both sides of the mold division surfaces 16 and 17 communicate with each other by matching the opening positions of the mold division surfaces 16 and 17. The opening shapes overlap each other.

  As described above, when the exhaust path 19x is conical, it is easy to cut at the small diameter portion when it is released from the vulcanizing mold 10, and the cutting position can be made constant. In particular, if the reverse taper shape in which the diameter gradually increases from the protrusion molding recess 18a toward the mold division surfaces 16 and 17, cutting can be performed at the boundary position between the protrusion molding recess 18a and the exhaust path 19x, Chipping of the protrusion 5a can be suppressed. In addition, when the vulcanized mold 10 is manufactured to have the reverse taper shape, the exhaust path 19 x can be easily formed using a drill from the mold division surfaces 16 and 17 side. The other configuration and operational effects of the second embodiment are the same as those of the first embodiment, and the description thereof will be omitted.

  FIG. 13 is a view showing the cross-sectional shape of the lateral groove molding rib 18 in the vulcanizing apparatus according to the third embodiment. The third embodiment differs from the first embodiment in that a slit-like exhaust path 19y is provided as the exhaust path 19.

  That is, the exhaust path 19y according to the third embodiment has a slit shape extending from the end face of the protrusion molding recess 18a on the mold dividing surface 16, 17 side to the mold dividing surface 16, 17, and the slit-like exhaust The height of the passage 19y is set to be equal to the depth of the protrusion molding recess 18a.

  As described above, the shape of the exhaust path 19 connected from the protrusion molding recess 18 a to the mold division surfaces 16 and 17 is not particularly limited, and various shapes can be adopted. About the 3rd embodiment, it is the same as that of a 1st embodiment about other composition and operation effects, and explanation is omitted.

  In the above embodiment, the exhaust path 19 is provided for the protrusion molding recesses 18a1 and 18a2 on both sides of the mold division surfaces 16 and 17, but it may be provided for any one protrusion molding recess 18a. Good. Further, the present invention is not necessarily limited to the case where a plurality of projection molding recesses 18a are provided, and in each lateral groove molding rib provided with a single projection molding recess, gold from the single projection molding recess is used. An exhaust path leading to the mold dividing surface may be provided.

  Examples of the tire according to the present embodiment include pneumatic tires for various vehicles such as tires for passenger cars, trucks, buses, heavy-duty tires such as light trucks (for example, SUV cars and pickup trucks).

  The above embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, substitutions, and modifications can be made without departing from the scope of the invention.

DESCRIPTION OF SYMBOLS 1 ... Tread part, 2 ... Side wall part, 3 ... Bead part, 5 ... Horizontal groove, 5a ... Protrusion, 10 ... Vulcanization mold, 11 ... Upper side plate, 12 ... Lower side plate, 13 ... Sector, 16, 17: mold division surface, 18: lateral groove molding rib, 18a: projection molding recess, 19, 19x, 19y: exhaust path, 31: segment, 33: upper mounting plate, 34: lower mounting plate, 36: upper surface Sliding surface, 38 ... Lower sliding surface

Claims (11)

Circumferentially divided sectors forming a tread portion of the tire;
A pair of upper and lower side plates for molding the sidewall portion of the tire;
A tire vulcanizing mold for vulcanizing and molding a tire, wherein a mold dividing line formed by the sector and the pair of upper and lower side plates is located in the tread portion,
A lateral groove forming rib for forming a lateral groove in the tread portion is provided straddling from the sector to the side plate, and a protrusion forming concave portion for forming a protrusion on the groove bottom of the lateral groove is provided on the lateral groove forming rib Provided
A mold division surface including the mold division line is provided to divide the lateral groove molding rib at a position where the projection molding recess is not provided, and the projection molding recess to the mold division surface A tire vulcanizing mold, wherein an exhaust path to be connected is provided to the lateral groove molding rib.   A plurality of the projection molding recesses are provided in the lateral groove molding rib, the mold division surface is set to pass between the adjacent projection molding recesses, and the exhaust path is at least one of the projection molding recesses The tire vulcanizing mold according to claim 1, wherein the mold is provided on the parting surface of the mold.   The tire vulcanizing mold according to claim 2, wherein the exhaust path is provided from the recess for projection molding on both sides of the mold dividing surface to the mold dividing surface.   The tire vulcanizing mold according to any one of claims 1 to 3, wherein the exhaust path is a cylindrical hollow portion.   The tire vulcanizing mold according to any one of claims 1 to 3, wherein the exhaust path is a conical hollow portion.   The tire vulcanizing mold according to any one of claims 1 to 3, wherein the exhaust path is slit-shaped.   The tire vulcanizing mold according to any one of claims 1 to 6, wherein the distance from the projection molding recess to the mold division surface is 5 mm or less. The tire vulcanizing mold according to any one of claims 1 to 7, and
A segment fixed to the sector and moving the sector in a tire radial direction;
And a pair of upper and lower attachment plates fixed to the upper and lower pair of side plates and slidably supporting the segments. The segment includes a pair of upper and lower sliding surfaces sliding on the pair of upper and lower mounting plates,
The pair of upper and lower sliding surfaces are inclined toward the center in the tire width direction toward the outer side in the tire radial direction,
9. The segment according to claim 8, wherein when the sector is moved outward in the tire radial direction, the upper and lower pair of sliding surfaces slide on the upper and lower pair of mounting plates to widen the space between the mold division surfaces. Tire vulcanizer as described.   The tire vulcanizing apparatus according to claim 9, wherein the mold division surface is provided in parallel with the tire radial direction.   The manufacturing method of a tire including the formation process which forms a green tire, and the vulcanization process which carries out the vulcanization formation of the green tire using the tire vulcanizing apparatus of any one of Claims 8-10.

Images